Shares of CBS were lower in extended trading on Thursday despite the media company reporting earnings in line with Wall Street estimates.

CBS posted adjusted fourth-quarter earnings per share of 92 cents on $3.91 billion in revenue. Analysts had expected CBS to report earnings of about 92 cents a share on $3.80 billion in revenue, according to a consensus estimate from Thomson Reuters.

Pandora posted weaker-than-expected earnings on Thursday, sending shares of the Internet radio service down more than 6 percent after the bell. Earlier in the day, shares of Pandora jumped more than 5 percent on a New York Times report that the company is working with Morgan Stanley to meet with potential buyers.

FireEye shares were lower in extended trading after the virtual security provider's CEO, Dave DeWalt, said he sees cybersecurity spending growing at a reduced rate this year. DeWalt said the industry's sales were boosted last year by "emergency spending" following major breaches that prompted some businesses to place massive orders for updated technology.

Shares of social media company Twitter inched higher in extended hours, a day after the company revealed in its quarterly earnings report a decline in active users on the platform.

AIG ticked higher in extended trading despite posting a fourth-quarter loss of $1.10 per share. The insurance giant also announced that it is adding a board member as part of a deal with activist investor Carl Icahn.

As part of that agreement, AIG will add Samuel Merksamer, managing director of Icahn Capital, to its board of directors in May. John Paulson, president of Paulson & Co., will also be joining AIG's board in May.

— Reuters and CNBC's Everett Rosenfeld and Christine Wang contributed to this report.